Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/7056#issuecomment-118081736
@JihongMA Thanks for reporting this.
As I tested, this behavior is the same as for Java's BigDecimal. So I am
wondering if this is really a problem to fix? Because when you create
`Decimal(2)` or `java.math.BigDecimal(2)`, actually you mean to create it with
precision 1 and scale 0, right? So isn't that the result can be expected?
scala> val t = new java.math.BigDecimal(2)
t: java.math.BigDecimal = 2
scala> val s = new java.math.BigDecimal(3)
s: java.math.BigDecimal = 3
scala> t.divide(s)
java.lang.ArithmeticException: Non-terminating decimal expansion; no
exact representable decimal result.
at java.math.BigDecimal.divide(BigDecimal.java:1616)
... 33 elided
scala> t.divide(s, BigDecimal.RoundingMode.HALF_UP.id)
res24: java.math.BigDecimal = 1
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